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To examine whether children who are deaf or hard of hearing who have hearing parents can develop age-level vocabulary skills when they have early exposure to a sign language. This cross-sectional study of vocabulary size included 78 children who are deaf or hard of hearing between 8 and 68months of age who were learning American Sign Language (ASL) and had hearing parents. Children who were exposed to ASL before 6months of age or between 6 and 36months of age were compared with a reference sample of 104 deaf and hard of hearing children
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